There are many death dates related to your details, but three of them seem to be corrent in 99% - neutral 78% / pessimistic 12% / optimistic 8%.

According to this site... I'm dead! What's wrong?

Read above. Apparently The Death has overslept. But don't worry, it will come eventually.

How can I send someone his/her Death Date?

Just pass them the url of the page with the results.

What are The Symbols of Death and how to read them?

There are three symbols related to your birth date. They are a clue to find the way you'll die. However, there are many ways of interpretation, so we can't give any direct answers - you are on your own.